redirect to webp stopped working in new version of chrome

something that might be important:

adding this to .htaccess
<filesMatch “.(ico|pdf|flv|jpg|jpeg|png|gif|svg|js|css|swf)$”>
Header set Cache-Control “max-age=84600, public”

causes error 500

Did it stop working after upgrading Chrome?
Which version of Chrome are you using?

Can you supply the URL to one of these sites?

https://sctpower.pt/

chrome 74.0.3729.131 64bits
console shows
JQMIGRATE: Migrate is installed, version 1.4.1
(index):211 [Intervention] Images loaded lazily and replaced with placeholders. Load events are deferred. See https://crbug.com/846170

In gtmetrix shows site correctly and before like 1 month it was working ok.

It seems to be working alright…

I see images when visiting with Chrome (Chromium, version 73).
In DevTools > Network, I see that they are delivered as webp.

The lazyloaded images which are set with CSS backgrounds are also working fine

Ie this one:
https://sctpower.pt/wp-content/uploads/2019/04/Efici%C3%AAncia-Energ%C3%A9tica-e1556191708857.jpg

Gives me the following headers:

Accept-Ranges: bytes
Cache-Control: public, max-age:86400, stale-while-revalidate=604800, stale-if-error=604800
Connection: Keep-Alive
Content-Encoding: gzip
Content-Length: 6695
Content-Type: image/webp
Date: Fri, 10 May 2019 15:53:05 GMT
ETag: “2d20eaf-1a10-5887c7a6def9c-gzip”
Expires: Sun, 09 Jun 2019 15:53:05 GMT
Keep-Alive: timeout=5, max=150
Last-Modified: Thu, 09 May 2019 23:04:54 GMT
Server: Apache
Vary: Accept-Encoding,User-Agent,Accept
X-WebP-Express: Redirected directly to existing web

on first load the picture

Request URL: https://sctpower.pt/wp-content/uploads/2019/01/Robbialac-300×149.jpg
Request Method: GET
Status Code: 200 OK (from memory cache)
Remote Address: 185.2.4.130:443
Referrer Policy: no-referrer-when-downgrade
Accept-Ranges: bytes
Cache-Control: public, max-age:86400, stale-while-revalidate=604800, stale-if-error=604800
Content-Length: 4336
Content-Type: image/webp
Date: Fri, 10 May 2019 15:57:26 GMT
ETag: “2d20e9d-10f0-5887c7a591f7e”
Expires: Sun, 09 Jun 2019 15:57:26 GMT
Last-Modified: Thu, 09 May 2019 23:04:53 GMT
Server: Apache
Vary: User-Agent,Accept
X-WebP-Express: Redirected directly to existing webp
Provisional headers are shown
range: bytes=0-2047
Referer: https://sctpower.pt/
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.131 Safari/537.36

should have loaded but it doesn’t.
if i hit ctrl+f5 the picture is loaded.

if plugin set no none, it displays on first load.

• This reply was modified 5 years, 6 months ago by bornwild.

Hm. That image actually shows in my browsers on first load.

Oh, I see that you have an error in the Cache-Control header.
The part that says “max-age:86400” should be “max-age=86400”.

Change the “:” to “=”.
Unfortunately, I provided a default value for the “custom” option which had a “:” instead of a “=” – See https://github.com/rosell-dk/webp-express/issues/221

I did not think of correcting the invalid headers due to this wrong default value, sorry. I have added an issue for it, so it will happen in the next release: https://github.com/rosell-dk/webp-express/issues/235

Next release is here, and the issue should now be automatically fixed by the update script